JP2008075617A - Cooling water system for hydraulic machinery - Google Patents

Cooling water system for hydraulic machinery Download PDF

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JP2008075617A
JP2008075617A JP2006258445A JP2006258445A JP2008075617A JP 2008075617 A JP2008075617 A JP 2008075617A JP 2006258445 A JP2006258445 A JP 2006258445A JP 2006258445 A JP2006258445 A JP 2006258445A JP 2008075617 A JP2008075617 A JP 2008075617A
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cooling water
water
draft tube
turbine
pump turbine
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JP5134227B2 (en
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Junya Suzuki
淳也 鈴木
Yuji Nakao
雄次 中尾
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Hitachi Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling water system for hydraulic machinery providing mid-air operation of the hydraulic machinery throughout a long period of time by suppressing temperature rising of cooling water. <P>SOLUTION: The cooling water system 8 for hydraulic machinery is provided with an elbow type draft tube 4 connected to an outlet side of a pump turbine 1, and a water intake 9 provided in a position below the draft tube 4 and taking in cooling water to be supplied to an apparatus 7. A drain outlet 10 is provided in a position above a discharge passage 5 in a downstream side of the draft tube 4 for draining cooling water used by the apparatus 7 to the discharge passage 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、水車やポンプ水車などの水力機械に係り、詳しくは、水力機械に備えられた機器にドラフトチューブ内の水を冷却水として供給する水力機械の冷却水系統に関する。   The present invention relates to a hydraulic machine such as a water turbine or a pump turbine, and more particularly, to a cooling water system of a hydraulic machine that supplies water in a draft tube as cooling water to a device provided in the hydraulic machine.

水車又はポンプ水車等の水力機械を備えた水力発電システムは、例えば上池から水圧管を通って到達する圧力水によって水力機械のランナを回転させ、これによって発電機を駆動させ発電する。水力機械のランナ回転に用いられエネルギーを失った圧力水は、水力機械の出口側に接続されたドラフトチューブ（吸出し管）及びその下流側の放水流路を通って下池へ流れる。この水力発電システムには、冷却水を必要とする機器（詳細には、例えばランナシール部、主軸封水装置、水車軸受、スラスト軸受、主要変圧器、空気冷却器、発電機軸受、及び液体抵抗器等）が備えられており、その機器に例えばドラフトチューブ内の水を冷却水として供給する冷却水系統を設けている。従来、冷却水系統の一例として、ドラフトチューブにおける下方位置に、冷却水を取水する取水口を設け、ドラフトチューブにおける取水口の下流側かつ上方位置に、前述した機器で使用された冷却水を排水する排水口を設けた構造が開示されている（例えば、特許文献１参照）。   A hydraulic power generation system equipped with a hydraulic machine such as a water turbine or a pump turbine rotates a runner of the hydraulic machine with, for example, pressure water reaching from the upper pond through a hydraulic pipe, thereby driving the generator to generate electric power. The pressure water that is used to rotate the runner of the hydraulic machine and loses energy flows to the lower pond through a draft tube (suction pipe) connected to the outlet side of the hydraulic machine and a water discharge channel on the downstream side thereof. This hydroelectric power generation system includes equipment that requires cooling water (specifically, for example, a runner seal, a main shaft sealing device, a turbine bearing, a thrust bearing, a main transformer, an air cooler, a generator bearing, and a liquid resistance. A cooling water system for supplying water in the draft tube as cooling water, for example. Conventionally, as an example of a cooling water system, an intake port for taking cooling water is provided at a lower position in the draft tube, and the cooling water used in the above-described equipment is drained at a downstream side and an upper position of the intake port in the draft tube. The structure which provided the drain outlet which performs is disclosed (for example, refer patent document 1).

特開平１−２５８９４号公報（第１頁、第１図）JP-A-1-25894 (first page, FIG. 1)

しかしながら、上記従来技術には以下のような課題が存在する。
例えば発電運転のように水力機械を水中運転させる場合は、水力機械から大量の水が放水されるので、ドラフトチューブ内の温度がほとんど上昇せず、ドラフトチューブの取水口から取水する冷却水の温度も機器の冷却に必要な適正温度となる。ところが、例えば調相運転などのように水力機械を空中運転させる（詳細には、水力機械のランナ室内に圧縮空気を入れた状態で回す）場合は、水力機械から放水される流れがないため、排水口からの使用済みの冷却水（すなわち比較的暖かい水）がドラフトチューブ内に滞留し、次第にドラフトチューブ内の水温が上昇する。そして、ついにはドラフトチューブ内の水温すなわち機器に供給する冷却水の温度が適正温度を上回り、機器保護のために水力機械が運転できない事態となるため、水力機械の空中運転を長時間に亘って行うことが困難であった。 However, there are the following problems in the above-described prior art.
For example, when a hydraulic machine is operated underwater as in power generation operation, a large amount of water is discharged from the hydraulic machine, so the temperature in the draft tube hardly rises, and the temperature of the cooling water taken from the intake of the draft tube Will be the appropriate temperature required for cooling the equipment. However, for example, when the hydraulic machine is operated in the air, such as in a phased operation (specifically, when the hydraulic machine is run with compressed air in the runner chamber), there is no flow discharged from the hydraulic machine. Used cooling water (that is, relatively warm water) from the drainage port stays in the draft tube, and the water temperature in the draft tube gradually increases. Finally, the temperature of the water in the draft tube, that is, the temperature of the cooling water supplied to the equipment exceeds the appropriate temperature, and the hydraulic machine cannot be operated to protect the equipment. It was difficult to do.

本発明の目的は、冷却水の温度上昇を抑え、水力機械の空中運転を長時間に亘り行うことができる水力機械の冷却水系統を提供することにある。   An object of the present invention is to provide a cooling water system for a hydraulic machine that can suppress an increase in the temperature of the cooling water and can perform aerial operation of the hydraulic machine for a long time.

（１）上記目的を達成するために、本発明は、水車又はポンプ水車の出口側に接続したエルボ式のドラフトチューブと、前記ドラフトチューブにおける下方位置に設けられ、機器に供給する冷却水を取水する取水口とを備えた水力機械の冷却水系統において、前記ドラフトチューブより下流側の放水流路における上方位置に設けられ、前記機器で使用された冷却水を前記放水流路に排水する排水口を備える。   (1) In order to achieve the above-mentioned object, the present invention takes in an elbow-type draft tube connected to the outlet side of a water turbine or a pump turbine, and cooling water supplied to a device provided at a lower position in the draft tube. In the cooling water system of a hydraulic machine having a water intake port, a drain port provided at an upper position in the water discharge channel downstream of the draft tube and used to drain the cooling water used in the device to the water discharge channel Is provided.

本発明においては、例えば調相運転などのように水車又はポンプ水車を空中運転させる場合、水車又はポンプ水車から放水される流れがないものの、ドラフトチューブの取水口から機器に供給する冷却水が取水され、機器で使用された冷却水が放水流路の排水口から排水される。このとき、排水口から排水される使用済みの冷却水は比較的暖かいので、放水流路内に対流が生じる。放水流路は、通常下流側に向かって上り勾配に設けるので、排水口からの暖かい水は放水流路の上側領域を下流側に向かって流れ、冷たい水は放水流路の下側領域を上流側（すなわち、ドラフトチューブ側）に向かって流れる。これにより、排水口からの暖かい水がドラフトチューブ内に流入するのを抑えることができる。したがって、ドラフトチューブ内の水温上昇を抑え、機器に供給する冷却水の温度上昇を抑えることができ、水力機械の空中運転を長時間に亘り行うことができる。   In the present invention, for example, when a water turbine or a pump turbine is operated in the air, such as in a phased operation, there is no flow discharged from the turbine or pump turbine, but the cooling water supplied to the device from the intake of the draft tube is taken in. Then, the cooling water used in the equipment is drained from the drain outlet of the discharge channel. At this time, since the used cooling water drained from the drain outlet is relatively warm, convection occurs in the water discharge flow path. Since the discharge channel is usually provided with an upward slope toward the downstream side, warm water from the drain outlet flows downstream in the upper region of the discharge channel, and cold water upstream in the lower region of the discharge channel. It flows toward the side (ie, the draft tube side). Thereby, it can suppress that the warm water from a drain outlet flows in into a draft tube. Therefore, it is possible to suppress an increase in the temperature of the water in the draft tube, to suppress an increase in the temperature of the cooling water supplied to the device, and to perform the aerial operation of the hydraulic machine for a long time.

（２）上記（１）において、好ましくは、前記水車又はポンプ水車の中心から前記排水口までの距離Ｌと前記水車又はポンプ水車のランナ出口径Ｄとの比Ｌ／Ｄは、１０≦Ｌ／Ｄ≦４０とする。   (2) In the above (1), preferably, the ratio L / D between the distance L from the center of the water wheel or pump water wheel to the drain outlet and the runner outlet diameter D of the water wheel or pump water wheel is 10 ≦ L / D ≦ 40.

本発明によれば、冷却水の温度上昇を抑え、水力機械の空中運転を長時間に亘り行うことができる。   ADVANTAGE OF THE INVENTION According to this invention, the temperature rise of a cooling water can be suppressed and the aerial operation of a hydraulic machine can be performed over a long time.

以下、本発明の一実施形態を、図面を参照しつつ説明する。
図１及び図２は、本発明の水力機械の冷却水系統の一実施形態が適用された水力発電システムの概略構造を表す図である。なお、図１はポンプ水車が空中運転した状態を表し、図２はポンプ水車が水中運転した状態を表す。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are diagrams showing a schematic structure of a hydroelectric power generation system to which an embodiment of a cooling water system of a hydraulic machine of the present invention is applied. 1 shows a state in which the pump turbine is operated in the air, and FIG. 2 shows a state in which the pump turbine is operated in the water.

図１及び図２において、この水力発電システムは、例えば立軸フランシス形のポンプ水車１と、上池（図示せず）からの圧力水をポンプ水車１に導入する水圧管２と、この水圧管２に設けられた入口弁３と、ポンプ水車１の出口側に接続されたエルボ式のドラフトチューブ（呼出し管）４と、このドラフトチューブ４の下流側に接続された放水流路５（例えばコンクリート等で形成された流路）及び下池６とを備えている。   1 and 2, this hydroelectric power generation system includes, for example, a vertical-axis Francis-type pump turbine 1, a hydraulic pipe 2 for introducing pressure water from an upper pond (not shown) to the pump turbine 1, and the hydraulic pipe 2 , An elbow draft tube (calling pipe) 4 connected to the outlet side of the pump turbine 1, and a water discharge channel 5 (for example, concrete or the like) connected to the downstream side of the draft tube 4 And a lower pond 6.

ポンプ水車１は、詳細は図示しないが、例えば渦巻き形のケーシングと、このケーシングに内包されたランナと、ケーシングのランナ外周側に設けられたガイドベーンと、ランナ室に圧縮空気を供給可能な空気系統とを備えている。そして、例えば発電運転する場合は、入口弁３及びポンプ水車１のガイドベーンを開放して圧力水によりランナを回転させ、これによって発電機（図示せず）を駆動させ発電する。そして、ポンプ水車１のランナ回転に用いられエネルギーを失った圧力水は、ドラフトチューブ４及び放水流路５を通って下池６へ流れるようになっている（図２参照）。一方、例えば調相運転する場合は、入口弁３及びポンプ水車１のガイドベーンを全閉するとともに、空気系統からの圧縮空気をランナ室に供給することにより、水面をランナより下方側（図１中下側）に押し下げ、ランナを空中回転させるようになっている。   Although the pump turbine 1 is not shown in detail, for example, a spiral casing, a runner included in the casing, a guide vane provided on the outer periphery of the runner of the casing, and air capable of supplying compressed air to the runner chamber System. For example, when performing a power generation operation, the inlet valve 3 and the guide vanes of the pump turbine 1 are opened and the runner is rotated by the pressure water, thereby driving a generator (not shown) to generate power. And the pressure water which lost the energy used for the runner rotation of the pump water turbine 1 flows into the lower basin 6 through the draft tube 4 and the water discharge channel 5 (see FIG. 2). On the other hand, for example, in the case of phased operation, the inlet valve 3 and the guide vanes of the pump turbine 1 are fully closed and the compressed air from the air system is supplied to the runner chamber so that the water surface is below the runner (FIG. 1). The runner is rotated in the air by pushing down to the middle and lower side.

また、水力発電システムには、冷却水を必要とする機器７（図では代表して１つのみ図示するが、例えばランナシール部、主軸封水装置、水車軸受、スラスト軸受、主要変圧器、空気冷却器、及び発電機軸受など）が備えられており、その機器７にドラフトチューブ４内の水を冷却水として供給する冷却水系統８が設けられている。以下、本実施形態の冷却水系統８について説明する。   In addition, in the hydropower generation system, only one device 7 that requires cooling water (only one representative is shown in the figure, for example, a runner seal, a main shaft sealing device, a turbine wheel bearing, a thrust bearing, a main transformer, an air And a cooling water system 8 for supplying the equipment 7 with water in the draft tube 4 as cooling water. Hereinafter, the cooling water system 8 of the present embodiment will be described.

ドラフトチューブ４における最下方位置には、機器７に供給する冷却水を取水する取水口９が設けられ、放水流路５における上方位置には、機器７で使用された冷却水を放水流路５に排水する排水口１０が設けられている。そして、ドラフトチューブ４の取水口９から給水配管系統１１（詳細には、例えば異物除去用のスクリーンやポンプ等（図示せず）が設けられた配管系統）を介し機器７に冷却水が供給され、機器７で使用された冷却水が排水配管系統１２を介し排水口１０から放水流路５に排水されるようになっている。   A water intake 9 for taking in the cooling water supplied to the device 7 is provided at the lowest position in the draft tube 4, and the cooling water used in the device 7 is discharged at the upper position in the water discharge flow channel 5. A drain port 10 for draining is provided. Then, cooling water is supplied from the water intake 9 of the draft tube 4 to the device 7 through a water supply piping system 11 (specifically, a piping system provided with a screen, pump, etc. (not shown) for removing foreign matter, for example). The cooling water used in the device 7 is drained from the drain port 10 to the discharge channel 5 through the drain piping system 12.

以上のように構成された本実施形態においては、例えば調相運転などのようにポンプ水車１を空中運転させる場合、ポンプ水車１から放水される流れがないものの、ドラフトチューブ４の取水口９から機器７に供給する冷却水が取水され、機器７で使用された冷却水が排水口１０から放水流路５に排水される。このとき、排水口１０から排水される使用済みの冷却水は比較的暖かいので、放水流路５内に対流が生じる。放水流路５は下流側に向かって上り勾配に設けるので、排水口１０からの暖かい水は放水流路５の上側領域を下流側（すなわち、下池６側）に向かって流れ、冷たい水は放水流路５の下側領域を上流側（すなわち、ドラフトチューブ４側）に向かって流れる（図１参照）。これにより、排水口１０からの暖かい水がドラフトチューブ４内に流入するのを抑えることができる。したがって、ドラフトチューブ４内の水温上昇すなわち冷却水の温度上昇を抑えることができ、ポンプ水車１の空中運転を長時間に亘り行うことができる。   In the present embodiment configured as described above, when the pump turbine 1 is operated in the air, for example, in the phase adjustment operation, there is no flow discharged from the pump turbine 1, but from the intake 9 of the draft tube 4. The cooling water supplied to the device 7 is taken in, and the cooling water used in the device 7 is drained from the drain port 10 to the water discharge channel 5. At this time, since the used cooling water drained from the drain port 10 is relatively warm, convection occurs in the water discharge channel 5. Since the water discharge channel 5 is provided with an upward slope toward the downstream side, warm water from the drain port 10 flows through the upper region of the water discharge channel 5 toward the downstream side (that is, the lower pond 6 side), and the cold water is discharged. It flows in the lower region of the water channel 5 toward the upstream side (that is, the draft tube 4 side) (see FIG. 1). Thereby, it is possible to suppress warm water from the drain outlet 10 from flowing into the draft tube 4. Therefore, the water temperature rise in the draft tube 4, that is, the temperature rise of the cooling water can be suppressed, and the pump turbine 1 can be operated in the air for a long time.

次に、本実施形態におけるポンプ水車１の空中運転時のドラフトチューブ４内の温度上昇について説明する。図３は、ポンプ水車１の中心から排水口１０までの距離Ｌとポンプ水車１のライナ出口径Ｄとの比Ｌ／Ｄと、ポンプ水車１の空中運転の所定時間経過後のドラフトチューブ４内の温度上昇幅ΔＴとの関係を表す特性図である。なお、図３は、ポンプ水車１のランナ出口径Ｄ＝２ｍとした場合の解析結果から得たものである。   Next, the temperature rise in the draft tube 4 during the aerial operation of the pump turbine 1 in this embodiment will be described. FIG. 3 shows the ratio L / D between the distance L from the center of the pump turbine 1 to the drain outlet 10 and the liner outlet diameter D of the pump turbine 1, and the inside of the draft tube 4 after a predetermined time has elapsed in the air operation of the pump turbine 1. It is a characteristic view showing the relationship with the temperature rise width ΔT. FIG. 3 is obtained from the analysis result when the runner outlet diameter D of the pump turbine 1 is 2 m.

この図３において、ポンプ水車１の中心から排水口１０までの距離Ｌとポンプ水車１のライナ出口径Ｄとの比Ｌ／Ｄの増加（言い換えれば、ポンプ水車１の中心から排水口１０までの距離Ｌの増加）に従って、ドラフトチューブ４内の温度上昇幅ΔＴが減少するようになっている。ここで、例えばポンプ水車１のランナ出口径Ｄ＝２ｍとした場合、ドラフトチューブ４の大きさにより決まる放水流路５までの最短距離Ｌminは２０ｍ程度であり、ドラフトチューブ４より下流側の放水流路５に排水口１０を設ければ、比Ｌ／Ｄ≧１０となる。そして、比Ｌ／Ｄ≧１０とすれば、所定時間経過後のドラフトチューブ４内の温度上昇幅ΔＴを２０℃以下に抑えることができる。特に、比Ｌ／Ｄ≧２５とすれば、ドラフトチューブ４内の温度上昇幅ΔＴの低減効果をより効果的に得ることができる。一方、比Ｌ／Ｄの増加、すなわちポンプ水車１の中心から排水口１０までの距離Ｌの増加に従って、排水配管系統１２の設備コストが増加するため、比Ｌ／Ｄ≦４０とすることが好ましい。   In FIG. 3, an increase in the ratio L / D between the distance L from the center of the pump turbine 1 to the drain outlet 10 and the liner outlet diameter D of the pump turbine 1 (in other words, from the center of the pump turbine 1 to the outlet 10). The temperature rise width ΔT in the draft tube 4 decreases as the distance L increases). Here, for example, when the runner outlet diameter D of the pump turbine 1 is set to 2 m, the shortest distance Lmin to the water discharge channel 5 determined by the size of the draft tube 4 is about 20 m, and the water discharge flow downstream from the draft tube 4 If the drainage port 10 is provided in the path 5, the ratio L / D ≧ 10. And if it is set as ratio L / D> = 10, the temperature rise width (DELTA) T in the draft tube 4 after predetermined time progress can be suppressed to 20 degrees C or less. In particular, if the ratio L / D ≧ 25, the effect of reducing the temperature rise ΔT in the draft tube 4 can be obtained more effectively. On the other hand, since the facility cost of the drainage piping system 12 increases as the ratio L / D increases, that is, the distance L from the center of the pump turbine 1 to the drain port 10 increases, it is preferable that the ratio L / D ≦ 40. .

なお、以上においては、ポンプ水車１はフランシス形を例にとって説明したが、これに限られず、例えばプロペラ形のポンプ水車又は水車などでもよいことは言うまでもない。   In the above description, the pump turbine 1 has been described by taking the Francis type as an example. However, the pump turbine 1 is not limited to this, and needless to say, for example, a propeller type pump turbine or a turbine may be used.

本発明の水力機械の冷却水系統の一実施形態が適用された水力発電システムの要部構成を表す図であり、ポンプ水車が空中運転した状態を表す。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing the principal part structure of the hydroelectric power generation system to which one Embodiment of the cooling water system | strain of the hydraulic machine of this invention was applied, and represents the state which the pump water turbine operated in the air. 本発明の水力機械の冷却水系統の一実施形態が適用された水力発電システムの要部構成を表す図であり、ポンプ水車が水中運転した状態を表す。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing the principal part structure of the hydroelectric power generation system to which one Embodiment of the cooling water system | strain of the hydraulic machine of this invention was applied, and represents the state which the pump-turbine operated underwater. ポンプ水車の中心から排水口までの距離Ｌとポンプ水車のライナ出口径Ｄとの比Ｌ／Ｄと、ポンプ水車の空中運転の所定時間経過後のドラフトチューブ内の温度上昇幅ΔＴとの関係を表す特性図である。The relationship between the ratio L / D of the distance L from the center of the pump turbine to the drain outlet and the liner outlet diameter D of the pump turbine and the temperature rise width ΔT in the draft tube after a predetermined time has elapsed in the pump turbine in the air. FIG.

符号の説明Explanation of symbols

１ ポンプ水車
４ ドラフトチューブ
５ 放水流路
７ 機器
８ 冷却水系統
９ 取水口
１０ 排水口 DESCRIPTION OF SYMBOLS 1 Pump turbine 4 Draft tube 5 Water discharge flow path 7 Equipment 8 Cooling water system 9 Intake port 10 Drain port

Claims (2)

水車又はポンプ水車の出口側に接続したエルボ式のドラフトチューブと、前記ドラフトチューブにおける下方位置に設けられ、機器に供給する冷却水を取水する取水口とを備えた水力機械の冷却水系統において、
前記ドラフトチューブより下流側の放水流路における上方位置に設けられ、前記機器で使用された冷却水を前記放水流路に排水する排水口を備えたことを特徴とする水力機械の冷却水系統。 In a cooling water system of a hydropower machine comprising an elbow-type draft tube connected to the outlet side of a water turbine or a pump turbine, and a water intake port provided at a lower position in the draft tube for taking cooling water to be supplied to equipment,
A cooling water system for a hydraulic machine, comprising a drain port provided at an upper position in the water discharge flow channel downstream of the draft tube and for discharging the cooling water used in the device to the water discharge flow channel. 請求項１記載の水力機械の冷却水系統において、前記水車又はポンプ水車の中心から前記排水口までの距離Ｌと前記水車又はポンプ水車のランナ出口径Ｄとの比Ｌ／Ｄは、１０≦Ｌ／Ｄ≦４０としたことを特徴とする水力機械の冷却水系統。   2. The cooling water system for a hydraulic machine according to claim 1, wherein a ratio L / D between a distance L from a center of the water turbine or pump turbine to the drain outlet and a runner outlet diameter D of the water turbine or pump turbine is 10 ≦ L A cooling water system for a hydraulic machine, characterized in that / D ≦ 40.
JP2006258445A 2006-09-25 2006-09-25 Hydraulic machine cooling water system Active JP5134227B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51130821A (en) * 1975-05-09 1976-11-13 Hitachi Ltd Water supply controlling method of water power plant and its device
JPS57129266A (en) * 1981-02-04 1982-08-11 Hitachi Ltd Coolant supply switching controller for hydraulic machine
JPS5825678A (en) * 1981-08-10 1983-02-15 Konishiroku Photo Ind Co Ltd Recording paper guiding device of copying machine or the like
JPH08144923A (en) * 1994-11-21 1996-06-04 Toshiba Corp Hydraulic machinery
JPH08284793A (en) * 1995-04-14 1996-10-29 Chubu Electric Power Co Inc Operating method for hydraulic machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51130821A (en) * 1975-05-09 1976-11-13 Hitachi Ltd Water supply controlling method of water power plant and its device
JPS57129266A (en) * 1981-02-04 1982-08-11 Hitachi Ltd Coolant supply switching controller for hydraulic machine
JPS5825678A (en) * 1981-08-10 1983-02-15 Konishiroku Photo Ind Co Ltd Recording paper guiding device of copying machine or the like
JPH08144923A (en) * 1994-11-21 1996-06-04 Toshiba Corp Hydraulic machinery
JPH08284793A (en) * 1995-04-14 1996-10-29 Chubu Electric Power Co Inc Operating method for hydraulic machine

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